Black Diamond PD park just east of the intersection of Lake Sawyer Rd SE and Roberts Ln. (also known as Auburn-Black Diamond Rd. outside of Black Diamond). They enforce the VERY LOW speed limit of 25 MPH west bound on Robert Ln., enforce the 50 mph zone on Auburn-Black-Diamond Rd. West of this intersection and those slowing down coming int othe 25 mph zone in Black Diamond, and watch for roll-through stops at the stop sign on Lake Sawyer Rd Se at this intersection; all from this one location. Sometimes they are almost completely hiden in an adjacent driveway. DO NOT SPEED ANYWHERE IN BLACK DIAMOND or roll-through ANY stop signs within Black Diamond. Interestingly, the court building in Black Diamond IS the police building, and the window you stand at to pay a trafic fine is only about six feet from a window to the BD Police Office. I don’t think there’s much chance of leniency from the court here!